GBU-28

 I. (noun) 

Sense 1

Meaning:

A 5,000 pound laser-guided bomb that can be programmed to penetrate to a given depth before exploding; used to penetrate hardened underground facilities

Synonyms:

Bunker Buster; GBU-28; Guided Bomb Unit-28

Classified under:

Nouns denoting man-made objects

Instance hypernyms:

laser-guided bomb; LGB (a smart bomb that seeks the laser light reflected off of the target and uses it to correct its descent)

Credits